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Lifted reconstruction as a feedback mechanism in the oscillating CO oxidation on Pt nanofacets: Microscopic evidences |
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| Authors: | Y Suchorski W Drachsel VV Gorodetskii H Weiss |
| Institution: | a Chemisches Institut, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, D-39106 Magdeburg, Germany b Boreskov Institute of Catalysis, Russian Academy of Sciences, Prosp.Lavrentieva 5, RU-630090 Novosibirsk, Russia c Department of Chemical Engineering, University of Washington, Box 351750, Seattle, WA 98195-1750, USA |
| Abstract: | Global and local oscillations in the CO oxidation reaction have been visualized in situ on the apex of a 1 0 0]-oriented Pt field emitter tip used as a well-defined model for catalytically active, nm-sized particles by Field Emission (FEM) and Lithium Field Desorption (Li-FDM) Microscopes. For the first time experimental evidence is provided that the reconstruction feedback mechanism of the self-maintained oscillations for the 1 0 0] and 1 1 0] orientations, which is well established on macroscopic single crystals, is also valid in the heterogeneous, nm-sized system with its different crystallographic orientations which are coupled by surface diffusion. |
| Keywords: | Field emission microscopy Field desorption microscopy Surface chemical reaction Surface relaxation and reconstruction Catalysis Platinum Alkali metals |
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